Welcome to Grainger Motor Group

19 Locations across East Anglia and Hertfordshire – Mantles Group & EMG Motor Group

Founded in 2022 by brothers Harry and Neal Grainger, Grainger Motor Group is one of the UK’s fastest-growing family-owned and operated dealer groups.

GMG consists of two highly respected automotive businesses: Mantles Group and EMG Motor Group. Together, the 19 locations are spread across leading vehicle franchises including Kia, Mazda, Honda, Nissan, MG and BYD.
Mantles Group represents Grainger Motor Group across Hertfordshire, centred around two well-known areas. Mantles Kia and BYD in Royston, plus 3 Norton Way dealerships (Honda, Nissan and Mazda) in Letchworth Garden City that have recently been acquired in 2026. Mantles has been in business for over 100 years, building up a reputation for its professionalism, transparency, and customer-first approach – leading to customers who keep coming back.

EMG Motor Group operates a large and established dealership network across the East Anglia, serving customers throughout Cambridgeshire, Bedfordshire, Suffolk, Norfolk, and beyond. With modern showrooms and expert local teams, EMG Motor Group has been providing customers with exceptional choice, knowledgeable advice, and a consistently high standard of service for over 50 years.

Our business is built on a simple but powerful commitment: to deliver an exceptional customer experience through knowledgeable, highly trained teams who care about our customers for life.

Whether you are searching for a new or used vehicle, we offer an extensive and diverse choice. We represent leading new car franchises including Kia, Mazda, BYD and MG, alongside a carefully selected stock of over 1,200 quality used vehicles, ensuring there is something to suit every lifestyle and budget.
Our commitment extends far beyond the point of sale. At Grainger Motor Group, our experienced aftersales teams provide expert care throughout your ownership journey. From servicing and repairs to MOTs, all work is carried out by manufacturer-accredited technicians using the highest standards of workmanship. We also represent authorised repairer requirements across Ford, Nissan, Vauxhall, Mitsubishi and Hyundai brands. Grainger Motor Group — delivering trust, expertise and care for every mile ahead.
Why buy from us?

Read more about how our group can help find your next car and the numerous reasons as to why you should trust us with the process.

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Award-Winning Performance

At Grainger Motor Group, our ambition is simple: to set the benchmark for automotive retail in the UK. We are proud to operate some of the country’s leading dealerships, recognised not only by our customers but by the industry itself.

Our commitment to excellence has been reflected in multiple prestigious awards, including:
Kia Excellence Awards 2025

GMG claimed 5 of the 7 total awards at the Kia Excellence awards in 2025, including:

Dealer of the year
- 1st Place: EMG Motor Group Cambridge
- 2nd Place: Mantles Kia
- 3rd Place: EMG Motor Group Ely
Other Categories
- EV Dealer of the Year: EMG Motor Group Cambridge
- Aftersales Excellence Award: EMG Motor Group Ely
Kia Excellence Awards 2024

GMG claimed 6 of the 7 total awards at the Kia Excellence awards in 2024, including:

Dealer of the year
- 1st Place: Mantles Kia
- 2nd Place: EMG Motor Group Cambridge
- 3rd Place: EMG Motor Group Thetford
Mantles Kia also won
- EV Dealer of the Year
- Sales Excellence Award
- Customer Experience Award
AM Awards 2025

The awards evening took place in May 2025 with the aim to set the benchmark for achievement across the motor retail sector. GMG took home the following 5 awards:
- Dealer Group of the Year
- Used Car Performance of the Year
- Franchised Dealership of the Year (Mantles Kia)
- EV Performance of the Year (Mantles Kia)
- Retailer of the Year (Special Award)
Motor Trader Awards 2024 & 2025

Taking place at the Grosvenor House Hotel on London's iconic Park lane, the awards take place every November for a night of celebration, recognition and networking. Over the past two years, GMG have won:
- 2024 Customer Care Award - Mantles Kia
- 2024 Most Improved Dealership of the year – Mantles Kia
- 2025 Aftersales Excellence Award – Grainger Motor Group
- 2025 Franchised Dealership of the Year – Mantles KIA
- 2025 Most Improved Dealership of the Year – EMG KIA & Mazda Cambridge
- 2025 Used Car Dealer Group of the Year – Grainger Motor Group
UK’s Best Workplaces™ 2026 by Great Place To Work®

Grainger Motor Group has been named one of the UK’s Best Workplaces™ 2026 by Great Place To Work®, ranking 79th in the large company category (201–1,000 employees) and standing as the only car dealership group in the top 100. The recognition is based on employee feedback, with 83% of staff saying it is a great place to work compared to 54% at a typical UK company.

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Our ambition is to excel in everything we do, and we understand that our people are at the heart of that success. We are dedicated to fostering a supportive environment where our employees can develop and flourish. As our business evolves, we are committed to ensuring our team grows alongside it, achieving success together.

Careers at GMG